Cassette for storing sheet media

ABSTRACT

A cassette for storing sheet media includes a box body with an opening, wherein the cassette further includes a pressing plate located in the box body, and a self-driven mechanism for driving the pressing plate to move towards the opening; the self-driven mechanism includes a support frame connected with the pressing plate, a driving shaft arranged on the support frame and driven by an elastic energy storage element, travelling gears synchronously moving on the two sides of the support frame, and guide racks matched with the travelling gears and extending along a stacking direction of the sheet media; and the travelling gears are driven by the driving shaft.

This disclosure claims the priority of Chinese patent application No. 201210457222.7, entitled “cassette for storing sheet medium” filed with the State Intellectual Property Office on Nov. 14, 2012, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD OF THE DISCLOSURE

The disclosure relates to a cassette for storing sheet media.

BACKGROUND OF THE DISCLOSURE

The self-service equipment, such as an automatic teller machine and a self-service card issuing machine, is provided with a cassette for storing sheet media such as banknotes or cards, wherein a pressing plate for stacking the sheet media and a driving mechanism for driving the pressing plate to elastically press the sheet media towards an opening of the cassette are arranged in the cassette, and when the sheet media continuously enter the cassette or are continuously discharged from the cassette, the pressing plate, under the driving of the driving mechanism, can always press the sheet media at the opening of the cassette in order.

A pressing plate driving mechanism for a cassette is disclosed in Chinese patent with the application number of 201110271197.9, and the cassette is used for storing cards to be issued. As shown in FIG. 1, A cassette 1′ includes a pressing plate 2′, a lead screw 5′, a volute spring 4′ and a nut 9′, wherein a plate surface of the pressing plate 2′ extends into the cassette for supporting stacked cards; the lead screw 5′ is located on one side of the pressing plate 2′, extends along a stacking direction of the cards in the cassette, is in threaded connection with the nut 9′ on a side edge of the pressing plate 2′, and can drive the pressing plate 2′ to move along the stacking direction of the cards when rotating; and an inner circle end of the volute spiral spring 4′ is in transmission connection with the lead screw 5′, and an outer circle end of the volute spring 4′ is fixedly connected with an inner wall of the cassette 1′. When external force or the cards press the pressing plate 2′ downwards when the cards are received, the nut 9′ drives the lead screw 5′ to rotate, thereby tightly winding the volute spring 4′ to accumulate the force; and when the cards are discharged, the volute spring 4′ applies force to the lead screw 5′ to enable the lead screw 5′ to rotate reversely, thereby lifting the pressing plate 2′ to elastically press the top first card at an outlet 6′.

The pressing plate driving mechanism has a problem that the lead screw 5′ for driving the pressing plate 2′ to move is located on a single side of the pressing plate 2′ and the pressing plate 2′ is easily inclined relative to the lead screw 5′ to increase transmission resistance between the nut 9′ and the lead screw 5′ when the sheet media stacked on the pressing plate 2′ are heavier, so that noise during the movement of the pressing plate 2′ is increased, and relative movement between the nut 9′ and the lead screw 5′ may be hindered to cause that the pressing plate 2′ cannot move smoothly and lower movement reliability.

SUMMARY OF THE DISCLOSURE

A purpose of the disclosure is to provide a cassette for storing sheet media, so as to improve the movement reliability of a pressing plate of the cassette.

To this end, the disclosure provides a cassette for storing sheet media, which includes a box body with an opening, wherein the cassette further includes a pressing plate located in the box body, and a self-driven mechanism for driving the pressing plate to move towards the opening; the self-driven mechanism includes a support frame connected with the pressing plate, a driving shaft arranged on the support frame and driven by an elastic energy storage element, travelling gears synchronously moving on the two sides of the support frame, and guide racks matched with the travelling gears and extending along a stacking direction of the sheet media; and the travelling gears are driven by the driving shaft.

Further, the travelling gears on each side of the support frame include a first gear and a second gear, which are engaged with each other, and the guide racks include a first rack and a second rack, which are located on the each side of the support frame and arranged in parallel at an interval; and the first gear is engaged with the first rack, and the second gear is engaged with the second rack.

Further, the pressing plate is pivoted to the support frame through a pivoting shaft in a winging way, and an axis of the pivoting shaft extends along a height direction of the box body.

Further, an axis of the driving shaft is perpendicular to the stacking direction of the sheet media.

Further, the cassette includes the box body being cuboidal, and a box door movably connected with the box body, wherein the opening extends in two adjacent sidewalls of the box body; and the box door has a folded state of being folded into the box body to open the opening.

Further, the box body includes a main body, and an upper cover hinged to the main body; the opening is formed in the upper cover, and is close to a side at which a hinging position of the upper cover is; and a safety lock is arranged between the upper cover and the main body.

Further, the box body includes a main body, and an upper cover hinged to the main body, the pressing plate and the self-driven mechanism are located in the main body, and a pressing plate backstop mechanism is arranged between the support frame of the self-driven mechanism and the upper cover.

Further, the pressing plate backstop mechanism includes a pawl arranged on the support frame, and a plurality of bayonets formed in the upper cover and matched with the pawl to limit the pawl to move in a direction away from the opening in a clamping way; and the plurality of bayonets are formed at intervals along the stacking direction of the sheet media.

Further, the support frame includes a first sidewall and a second sidewall which are arranged in parallel at an interval, and a top wall and a bottom wall which extend between the first sidewall and the second sidewall; and the driving shaft is supported on the first sidewall and the second sidewall, and is located between the top wall and the bottom wall.

Further, two operating recesses symmetric about a width centre of the support frame are formed in a side, close to the opening, of the support frame.

According to the cassette provided by the disclosure, the self-driven mechanism of the pressing plate includes the driving shaft parallel to the pressing plate, the elastic energy storage element wound on the driving shaft, the travelling gears synchronously moving on the two sides of the pressing plate respectively, and the guide racks matched with the travelling gears, wherein the guide racks extend along the stacking direction of the sheet media, and when the pressing plate is driven by external force to move in the direction away from the opening A of the cassette, the travelling gears drive the driving shaft to rotate, and the elastic energy storage element stores energy along with the rotation of the driving shaft; and in case of no external force, the elastic energy storage element releases the accumulated energy to drive the pressing plate to move in the direction close to the opening A along the guide racks matched with the travelling gears along with the travelling gears, and the guide racks function in guiding the movement of the pressing plate to ensure the stable movement of the pressing plate without inclination and improve the movement reliability of the pressing plate.

Besides the purpose, characteristics and advantages described above, the disclosure has other purposes, characteristics and advantages, which are further described with the drawings in detail.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings forming a part of the specification and used for further understanding the disclosure show preferred embodiments of the disclosure, and is adopted to describe the principle of the disclosure together with the specification. In the drawings:

FIG. 1 is a structure view of a pressing plate self-driven mechanism of a cassette in the prior art;

FIG. 2 is a first isometric view of a structure of a cassette according to an embodiment of the disclosure, an outlet of the cassette being closed;

FIG. 3 is a second isometric view of a structure of a cassette according to an embodiment of the disclosure, an outlet of the cassette being closed;

FIG. 4 is a third isometric view of a structure of a cassette according to an embodiment of the disclosure, an upper cover of the cassette being opened;

FIG. 5 is a local structure view of a cassette according to an embodiment of the disclosure;

FIG. 6 is a local structure view of a cassette which is empty according to an embodiment of the disclosure;

FIG. 7 is a local structure view of a cassette in which sheet media are stored according to an embodiment of the disclosure;

FIG. 8 is a local structure view of a pressing plate assembly of a cassette according to an embodiment of the disclosure; and

FIG. 9 is a local structure section view of a pressing plate assembly of a cassette according to an embodiment of the disclosure.

DESCRIPTION ABOUT THE REFERENCES IN THE DRAWINGS

1. box body; 2. box door;

3. pressing plate assembly; 4. support frame;

5. pressing plate; 6. self-driven mechanism;

8. pressing plate backstop mechanism; 9. safety lock;

11. front wall; 12. rear wall;

13. left wall; 14. right wall;

15. upper wall; 16. lower wall;

17. main body; 18. upper cover;

19. pivoting shaft; 41. first sidewall;

42. second sidewall; 43. operating recess;

44. top wall; 45. bottom wall;

46. bracket;

51. pivoting shaft; 61. driving shaft;

62. elastic energy storage element; 63. travelling gear;

64. guide rack; 81. pawl;

82. elastic element; 83. rotating shaft;

91. lock cylinder; 92. spring bolt;

181. bayonet; 182. limiting part;

641. first rack; 642. second rack;

631. first gear; 632. second gear; and

811. guide surface.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The embodiment of the disclosure is described below with reference to the drawings in detail, but the disclosure can be implemented by various modes defined and covered by claims.

As shown in FIG. 2 to FIG. 5, a cassette includes a box body 1, a box door 2 and a pressing plate assembly 3.

Wherein, the box body 1 is of a cuboidal structure for storing sheet media such as banknotes and cards. The box body 1 includes a front wall 11, a rear wall 12, a left wall 13, a right wall 14, an upper wall 15 and a lower wall 16, wherein the upper wall 15 and the lower wall 16 are parallel, and arranged at a preset distance; the left wall 13 and the right wall 14 are parallel, and arranged at a preset distance; and the front wall 11 and the rear wall 12 are parallel, and arranged at a preset distance. The sheet media are stacked along a depth direction (a forward-backward direction shown in FIG. 2) of the box body 1 in the box body, a length of the sheet media corresponds to a width direction (a leftward-rightward direction shown in FIG. 2) of the box body 1, a width of the sheet media corresponds to a height (upward-downward direction shown in FIG. 2) of the box body 1, and an opening A for inputing or discharging the sheet media is formed in a sidewall of the box body 1. In the embodiment, the opening A extends in the rear wall 12 and the upper wall 15, which are adjacent, and is shaped like an inverted L. When the sheet media in the cassette need to be discharged from the opening A, a conveying roller B matched with the stacked sheet media in a contacting way can be arranged at the opening A, and can be driven to rotate to discharge the sheet media from the box body 1.

The box door 2 is movably connected with the box body 1, can be opened or closed relative to the box body 1, and has a folded state of being folded into the box body 1 for opening the opening A; and when the box door 2 is closed relative to the box body 1, the opening A of the box body can be sealed, and when the box door 2 is opened relative to the box body 1, the opening A can be exposed, and the sheet media can be fed into the box body 1 through the opening A or discharged from the box body 1 through the opening A.

Furthermore, as shown in FIG. 4, the upper wall 15 and a part of the rear wall 12 of the box body 1 are combined into an upper cover 18, and the other part of the rear wall 12 of the box body 1, the front wall 11, the left wall 13, the right wall 14, and the lower wall 16 are combined into a main body 17 for storing the sheet media; and the upper cover 18 is L-shaped, is pivoted to the main body 17 through a pivoting shaft 19, and can be opened or closed relative to the main body 17. In the embodiment, the box door 2 is movably connected with the upper cover 18, and when the box door 2 is driven to move relative to the upper cover 18, the opening A in the upper cover 18 can be sealed or exposed. When the upper cover 18 is opened relative to the main body 17, the sheet media such as banknotes and cards can be fed into the box body 1; when the upper cover 18 is closed relative to the main body 17, and the opening A is sealed by the box door 2, the main body 17, the upper cover 18 and the box door 2 form a sealed cassette; and when the upper cover 18 is closed relative to the main body 17, and the opening A is exposed by the box door 2, the sheet media such as banknotes and cards in the box body 1 can be discharged from the box body or fed into the box body through the opening A.

Furthermore, the cassette further includes a safety lock 9. The safety lock 9 is fixedly arranged on the main body 17 or the upper cover 18 for fixing the upper cover 18 at a locking position where the upper cover 18 is closed relative to the main body 17. In the embodiment, the safety lock 9 is fixedly arranged on the main body 17, and includes a lock cylinder 91 and a spring bolt 92, wherein the lock cylinder 91 is matched with the main body 17 in a plugging way, and can freely rotate around own axis; and the spring bolt 92 is fixedly connected with the lock cylinder 91, and when a key is inserted into the lock cylinder 91 and rotates, the spring bolt 92 can be driven to rotate or extend and contract to be matched with or separated from a limiting part 182 of the upper cover 18. The limiting part 182 may be a baffle plate or a slotted hole. In the embodiment, the limiting part 182 is a slotted hole, and when a key is inserted into the lock cylinder 91 and rotates, the spring bolt 92 can be driven to rotate to be matched with or separated from the slotted hole in the upper cover 18 in a clamping way.

When the spring bolt 92 on the main body 17 is matched with the limiting part 182 on the upper cover in the clamping way, the upper cover 18 cannot be opened relative to the main body 17 in case of no key; and when the spring bolt 92 is driven by the key to be separated from the limiting part 182, the upper cover 18 can be opened, and the sheet media are fed into the box body 1.

As shown in FIG. 5 and FIG. 6, the pressing plate assembly 3 is located in the box body 1 for pressing the sheet media stacked in the box body 1 towards a limiting surface at the opening A of the box body 1, wherein, the limiting surface is parallel to surfaces of the sheet media. In the embodiment, the opening A is located in the rear wall 12 and the upper wall 15, and the rear wall 12 is the limiting surface for limiting positions of the sheet media at the opening A, so that the pressing plate assembly 3 is used for pressing the sheet media stacked in the box body 1 towards the rear wall 12.

The pressing plate assembly 3 includes a support frame 4, a pressing plate 5 and a self-driven mechanism 6, wherein the support frame 4 is preferably a metal sheet part, and includes a first sidewall 41, a second sidewall 42, a top wall 44 and a bottom wall 45, which are parallel and arranged at preset distances; the distance between the first sidewall 41 and the second sidewall 42 is a width of the support frame 4, and a width direction of the support frame 4 corresponds to that of the box body 1; the pressing plate 5 is connected with the support frame 4, is located on the side, close to the limiting surface, of the support frame 4, and is arranged in parallel with the limiting surface; under the action of the self-driven mechanism 6, the pressing plate 5 and the support frame 4 always have a movement tendency of pressing the sheet media between the pressing plate 5 and the limiting surface on the limiting surface close to the limiting surface. In the embodiment, the pressing plate 5 is located on the side, close to the rear wall 12, of the support frame 4, and, under the action of the self-driven mechanism 6, always has a movement tendency of pressing the sheet media on the rear wall 12.

The self-driven mechanism 6 includes a driving shaft 61, an elastic energy storage element 62 and two transmission assemblies. Wherein, two ends of the driving shaft 61 are supported by the first sidewall 41 and second sidewall 42 of the support frame 4, and protrude from outer surfaces of the first sidewall 41 and the second sidewall 42 respectively, and can freely rotate around own axis; the elastic energy storage element 62 is wound on the driving shaft 61, and is located between the first sidewall 41 and second sidewall 42 of the support frame 4; a first end (not shown in Figs.) of the elastic energy storage element 62 is connected with the driving shaft 61, and a second end (not shown in Figs.) of the elastic energy storage element 62 is connected with the support frame 4; and the elastic energy storage element 62 is used for accumulating energy and driving the driving shaft 61 to rotate, and may be a torsional spring, a volute spring or a rubber band. The two transmission assemblies are located at outer sides of the first sidewall 41 and second sidewall 42 of the support frame 4 respectively, and are arranged symmetrically about a width centre between the first sidewall 41 and the second sidewall 42. Each transmission assembly includes travelling gears 63 and guide racks 64, wherein the guide racks 64 of the two transmission assemblies are fixedly arranged on inner surfaces of the right wall 14 and left wall 13 of the box body 1 respectively, and extend along a stacking direction of the sheet media; guide racks 64 include a first rack 641 and a second rack 642, which are arranged in parallel at a preset distance along a height direction of the box body 1; and travelling gears 63 of the two transmission assemblies are arranged on the outer surfaces of the second sidewall 42 and first sidewall 41 of the support frame 4 respectively, travelling gears 63 include a first gear 631 and a second gear 632, which are engaged with each other, and preferably, the first gears 631 and the second gears 632 are arranged along the height direction of the box body 1. Wherein, the first gear 631 on the outer surface of the second sidewall 42 of the support frame 4 is fixedly connected with the end, extending out of the second sidewall 42 of the support frame 4, of the driving shaft 61, and is simultaneously engaged with the first rack 641 arranged on the outer surface of the second sidewall 42 of the box body 1, and the second gear 632 on the outer surface of the second sidewall 42 of the support frame 4 is engaged with the second rack 642 arranged on the second sidewall 42 of the box body 1; and the first gear 631 on the outer surface of the first sidewall 41 of the support frame 4 is fixedly connected with the end, extending out of the first sidewall 41 of the support frame 4, of the driving shaft 61, and is simultaneously engaged with the first rack 641 arranged on the left wall 13 of the box body 1, and the second gear 632 on the outer surface of the first sidewall 41 of the support frame 4 is engaged with the second rack 642 arranged on the left wall 13 of the box body 1.

When the pressing plate 5 is driven by external force to move in a direction away from the opening A, the first gears 631 and the second gears 632 in the two transmission assemblies at the two sides of the support frame 4 rotate at the same time of moving away from the opening A along the first racks 641 and the second racks 642, which are matched with the first gears 631 and the second gears 632, respectively, and the first gears 631 rotate to drive the driving shaft 61 to rotate along a first direction to tightly wind the elastic energy storage element 62 on the driving shaft 61 to accumulate preset energy. In case of no external force, the elastic energy storage element 62 releases the accumulated energy to drive the driving shaft 61 to rotate along a second direction opposite to the first direction to enable the first gears 631 and the second gears 632 in the two transmission assemblies at the two sides of the support frame 4 to rotate and simultaneously move towards the direction close to the opening A along the first racks 641 and the second racks 642, which are matched with the first gears 631 and the second gears 632, respectively, thereby driving the support frame 4 and the pressing plate 5 to move along the first racks 641 and the second racks 642, and close to the limiting surface.

Preferably, the pressing plate 5 is pivoted to the support frame 4 through a pivoting shaft 51 in a swinging way, and the pivoting shaft 51 extends along the height direction of the box body, and is located on a central surface of the support frame 4 along the width direction, so that the pressing plate 5 can be adaptively regulated to make the pressing plate fit tightly with a contact surface of a stack of sheet media, and can be adaptively regulated to ensure the attachment degree with the contact surface of the sheet media even though the support frame is inclined by non-uniform stress. In the other embodiment, the pressing plate 5 and the support frame 4 can be integrally formed under the condition of no adaptive regulation requirement.

Preferably, two operating recesses 43 are formed symmetrically about a width centre in the side, close to the opening A, of the support frame 4, so that it is convenient to operate when a force is applied to drive the support frame 4 to move in a direction away from the opening A, and the support frame 4 can be uniformly stressed and prevented from being inclined.

Working processes when the cassette provided by the disclosure is empty and the sheet media are fed into and discharged from the cassette will be introduced below.

FIG. 6 is a local structure view of a cassette which is empty according to an embodiment of the disclosure, and FIG. 7 is a local structure view of a cassette which is loaded according to an embodiment of the disclosure. As shown in FIG. 6, when the cassette is empty, the elastic accumulation element 62 is wound on the driving shaft 61 with a smaller preloading force, the pressing plate is pressed against the rear wall 12 (i.e. the limiting surface), and the first gears 631 and the second gears 632 are engaged with the first racks 641 and the second racks 642 respectively, and are located a position close to the opening A. As shown in FIG. 7, when the cassette is fed, the support frame 4 and the pressing plate 5 move in the direction away from the opening A under the action of external force, that is, the support frame 4 and the pressing plate 5 are pressed towards a front part of the box body 1 from back to front, the first gears 631 and the second gears 632 rotate at the same time of moving away from the opening A along the first racks and the second racks, the first gears 631 rotate to drive the driving shaft 61 to rotate along with the first gears 631 to continuously and tightly wind the elastic energy storage element 62, and when the support frame 4 and the pressing plate 5 reach the front part of the box body 1, that is, when the cassette is full, the elastic energy storage element 62 is tightly wound to pre-accumulate preset energy, at this time, under the action of the elastic energy storage element 62, the pressing plate 5 closely presses the sheet media onto the rear wall 12 (i.e. the limiting surface).

When the sheet media in the cassette are continuously discharged, along with continuous decrease of the sheet media between the pressing plate 5 and the rear wall 12, the elastic energy storage element 62 releases the accumulated energy to drive the driving shaft 61 to rotate so as to drive the first gears 631 and the second gears 632 to rotate and simultaneously move towards the opening A along the first racks 641 and the second racks 642, thereby driving the support frame 4 and the pressing plate 5 to move in the direction close to the opening A, along the first racks 641 and the second racks 642, to closely press the stacked sheet media onto the rear wall 12 (i.e. the limiting surface) all the time.

The self-driven mechanism of the pressing plate assembly of the cassette provided by the disclosure includes the driving shaft parallel to the pressing plate, the elastic energy storage element wound on the driving shaft, and the two transmission assemblies located on the two sides of the pressing plate respectively, wherein each transmission assembly includes the guide rack and the travelling gear; the guide racks extend along the stacking direction of the sheet media; when the pressing plate is driven by the external force to move in the direction away from the opening A of the cassette, the travelling gears rotate at the same time of moving away from the opening A along the guide racks matched with the travelling gears to drive the driving shaft to rotate, and the elastic energy storage element accumulates energy; and in case of no external force, the elastic energy storage element releases the accumulated energy to drive the driving shaft to rotate to enable the travelling gears to rotate and simultaneously move in the direction close to the opening A along the guide racks matched with the travelling gears, thereby driving the pressing plate to move towards the opening A; therefore, the match between the travelling gears and the guide racks not only enables the elastic energy storage element wound on the driving shaft to accumulate energy, but also provides a function of guiding the movement of the pressing plate so as to ensure the stable movement of the pressing plate without inclination and improve the movement reliability of the pressing plate.

When the cassette is used for providing the sheet media for a sheet medium deposit device (that is, the sheet media are discharged from the opening A of the cassette), the pressing plate assembly 3 further includes a pressing plate backstop mechanism 8. As shown in FIG. 8 and FIG. 9, the pressing plate backstop mechanism 8 includes a rotating shaft 83, a pawl 81, and an elastic element 82, wherein the rotating shaft 83 is supported by a bracket 46 fixedly connected to the support frame 4, and an axis of the rotating shaft 83 is parallel to the driving shaft 61; the pawl 81 is pivoted to the support frame 4 through the rotating shaft 83, can rotate around the rotating shaft 83, and is provided with a guide surface 811; the distance between the end, close to the opening A, of the guide surface and the rotating shaft 83 is less than that between the end, away from the opening A, of the guide surface and the rotating shaft 83; correspondingly, a plurality of bayonets 181 (see FIG. 4) corresponding to a position of the pawl 81 are formed at intervals along the stacking direction of the sheet media in the inner wall of the upper cover 18, and the pawl 81 can be matched with one of the plurality of bayonets 181 in the clamping way; and one end of the elastic element 82 is connected with the pawl 81, the other end of the elastic element 82 is connected with the support frame 4, and the pawl 81 always tends to rotate towards the bayonets 181 around the rotating shaft 83 under the action of the elastic element 82. Preferably, the pawl 81 is located in the width centre of the box body 1.

Therefore, when the pressing plate assembly 3 moves in the direction close to the opening A under the action of the elastic energy storage element 62, the pawl 81 can sequentially pass through each bayonet 181 under the guide of the guide surface 811; and when the pressing plate assembly 3 is stressed to move in the direction away from the opening A in case of an accident such as falling of the cassette, the pawl 81 is matched with the closest bayonet 181 in the clamping way, thereby preventing the sheet media stacked between the pressing plate 5 and the limiting surface from being scattered.

The above is only the preferred embodiment of the disclosure and not intended to limit the disclosure, and for those skilled in the art, the disclosure can have various modifications and variations. Any modifications, equivalent replacements, improvements and the like within the spirit and principle of the disclosure shall fall within the scope of protection of the disclosure. 

What is claimed is:
 1. A cassette for storing sheet media, comprising a box body (1) with an opening (A), wherein the cassette further comprises a pressing plate (5) located in the box body (1), and a self-driven mechanism (6) for driving the pressing plate (5) to move towards the opening (A); the self-driven mechanism (6) comprises a support frame (4) connected with the pressing plate (5), a driving shaft (61) arranged on the support frame (4) and driven by an elastic energy storage element (62), travelling gears (63) synchronously moving on the two sides of the support frame (4), and guide racks (64) matched with the travelling gears (63) and extending along a stacking direction of the sheet media; and the travelling gears (63) are driven by the driving shaft (61).
 2. The cassette for storing the sheet media according to claim 1, wherein the travelling gears (63) on each side of the support frame (4) comprise a first gear (631) and a second gear (632), which are engaged with each other, and the guide racks (64) comprise a first rack (641) and a second rack (642), which are located on the each side of the support frame (4) and arranged in parallel at an interval; and the first gear (631) is engaged with the first rack (641), and the second gear (632) is engaged with the second rack (642).
 3. The cassette for storing the sheet media according to claim 1, wherein the pressing plate (5) is pivoted to the support frame (4) through a pivoting shaft (51) in a winging way, and an axis of the pivoting shaft (51) extends along a height direction of the box body (1).
 4. The cassette for storing sheet media according to claim 1, wherein an axis of the driving shaft (61) is perpendicular to the stacking direction of the sheet media.
 5. The cassette for storing the sheet media according to claim 1, wherein the cassette comprises the box body (1) being cuboidal, and a box door (2) movably connected with the box body (1), wherein the opening (A) extends in two adjacent sidewalls of the box body (1); and the box door (2) has a folded state of being folded into the box body (1) to open the opening (A).
 6. The cassette for storing the sheet media according to claim 1, wherein the box body (1) comprises a main body (17), and an upper cover (18) hinged to the main body (17); the opening (A) is formed in the upper cover (18), and is close to a side at which a hinging position of the upper cover (18) is; and a safety lock (9) is arranged between the upper cover (18) and the main body (17).
 7. The cassette for storing sheet media according to claim 1, wherein the box body (1) comprises a main body (17), and an upper cover (18) hinged to the main body (17), the pressing plate (5) and the self-driven mechanism (6) are located in the main body (17), and a pressing plate backstop mechanism (8) is arranged between the support frame (4) of the self-driven mechanism (6) and the upper cover (18).
 8. The cassette for storing sheet media according to claim 7, wherein the pressing plate backstop mechanism (8) comprises a pawl (81) arranged on the support frame (4), and a plurality of bayonets (181) formed in the upper cover (18) and matched with the pawl (81) to limit the pawl (81) to move in a direction away from the opening (A) in a clamping way; and the plurality of bayonets (181) are formed at intervals along the stacking direction of the sheet media.
 9. The cassette for storing the sheet media according to claim 1, wherein the support frame (4) comprises a first sidewall (41) and a second sidewall (42) which are arranged in parallel at an interval, and a top wall (44) and a bottom wall (45) which extend between the first sidewall (41) and the second sidewall (42); and the driving shaft (61) is supported on the first sidewall (41) and the second sidewall (42), and is located between the top wall (44) and the bottom wall (45).
 10. The cassette for storing the sheet media according to claim 9, wherein two operating recesses (43) symmetric about a width centre of the support frame (4) are formed in a side, close to the opening (A), of the support frame (4). 